Meet Encly: introduce the successor and move all notes to it

[pasichDev]

My Notes gets a successor: Encly, a fully encrypted, offline notes app (encrypted database, PIN lock, encrypted backups). This release introduces it and lets users move everything over in one tap.

One way only. My Notes → Encly. Encly never sends anything back.

Counterpart: pasichDev/Encly#46 (the receiving side). That ships first; this button appears only when the installed Encly can receive.

Page "Meet Encly"

• New screen reachable from the drawer (next to newVersion) and a one-time dialog on the first start of this version (reuse the what's-new flow).
• What Encly is and what changes for the user; honest about what does not move (see open questions).
• Encly not installed → "Get Encly" (market://details?id=com.pasich.encly, web fallback).
• Encly installed and able to receive → "Move my notes to Encly".
• Strings in all 11 locales.

Hand-off (contract shared with Encly)

• <queries><package android:name="com.pasich.encly" /></queries>.

• Before sending plaintext, check the receiver: hasSigningCertificate("com.pasich.encly", 6884c693354964276231e6d0336b965f690bf3f15a0707bb59505c208e5e7554, CERT_INPUT_SHA256) (the same certificate on Play, F-Droid and GitHub) and that it resolves com.pasich.encly.action.IMPORT_FROM_MY_NOTES.

• Build a ZIP in cacheDir: handoff.json (format mynotes-handoff, schema: 1).

  • notes including trashed (attachment files are not sent; the page and the result say how many stay behind) (title, value, valueJson, date, tag, isTrash, isPinned), tags, tasks, task categories
  • each record with a stable id (sync_metadata.stableId, else mynotes:<type>:<id>)
  • raw data only, no mapping here

• Explicit intent with the FileProvider URI and FLAG_GRANT_READ_URI_PERMISSION, startActivityForResult; delete the ZIP afterwards whatever the outcome.

• Show the result counts from Encly. Nothing is deleted from My Notes automatically; offer to clear it only after a successful move, as a separate confirmed step.

• Tests: payload builder (plain, ## Decided

• Attachments and images do not move; the page and the result say how many stay in My Notes.

• Nothing is deleted automatically. After a successful move, offer "Clear My Notes" as a separate step with its own confirmation.